Abstract：The epoxy matrix toughened by nano-Al2O3 was prepared by mechanical mixing method.The mechanical properties of epoxy matrix with different nano-Al2O3 content were researched.The fracture toughness of the epoxy matrix was studied by compact tension test method.The glass-fiber reinforced composites were fabricated using the toughened epoxy matrix and the mechanical properties of the composites were investigated.The results indicate that the improved fracture toughness of epoxy matrix and the enhanced bonding between fibers and resin matrix can be attributed to the nanoparticles.Therefore,the interlaminar shear strength of the composites is improved obviously,while the other mechanical properties increase faintly.
 HSU Y G,LIANG,C W.Properties and behavior of CTBN-modified epoxy with IPN structure[J].Journal of Applied Polymer Science,2007,106:1576-1584.  KONG J,NING R C,TANG Y S.Study on modification of epoxy resins with acrylate liquid rubber containing pendant epoxy groups[J].Journal of Materials Science,2006,41(5):1639-1641.  MIMURA K,ITO H,FUJIOKA H.Improvement of thermal and mechanical properties by control of morphologies in PES-modified epoxy resins[J].Polymer,2000,41:4451-4459.  FRANCIS B,THOMAS S,JOSE J,et al.Hydroxyl terminated poly(ether ether ketone)with pendent methyl group toughened epoxy resin:miscibility,morphology and mechanical properties[J].Polymer,2005,46:12372-12385.  INOUE T.Reaction-induced phase decomposition in polymer blends[J].Progress in Polymer Science,1995,20:119-153.  张明,罗业,党国栋,等.含氟聚醚醚酮增韧环氧树脂相形貌与性能研究[J].热固性树脂,2008,23(6):1-4.  ZHANG Hui,TANG Long-cheng,ZHANG Zhong,et al.Fracture behaviours of in situ silica nanoparticle-filled epoxy at different temperatures[J].Polymer,2008,49:3816-3825.  RICHARD D W,MALHOTRA V M.Rupture of nanoparticle agglomerates and formulation of Al_2O_3-epoxy nanocomposites using ultrasonic cavitation approach:effects on the structural and mechanical properties[J].Polymer Engineering and Science,2006,10:426-430.  ZHENG Ya-ping,ZHENG Ying,NING Rong-chang.Effects of nanoparticles SiO2 on the performance of nanocomposites[J].Materials Letters,2003,57:2940-2944.  ZHENG Ya-ping,NING Rong-chang,ZHENG Ying.Study of SiO2 nanoparticles on the improved performance of epoxy and fiber composites[J].Journal of Reinforced Plastics and Composites,2005,24:223-233.  ZHU J B,YANG X J,CUI Z D,et al.Preparation and properties of nano-SiO2/epoxy composites cured by mannich amine[J].Journal of Macromolecular Science,Part B:Physics,2006,45(5):811-820.  ZHANG H,ZHANG Z,FRIEDRICH K,et al.Property improvements of in situ epoxy nanocomposites with reduced interparticle distance at high nanosilica content[J].Acta Materialia,2006,54:1833-1842.  KOJIMA Y,USUKI A,KAWASUMI M,et al.Mechanical-properties of nylon 6-clay hybrid[J].Journal of Materials Research,1993,8(5):1185-1189.  CHEN C,BENSON-TOLLE T,BAUR J W,et al.Processing-morphology regulation of epoxy/layered-silicate nanocomposites[J].Journal of Applied Polymer Science,2008,108(5):3324-3333.  HUSSAIN M,NAKAHIRA A,NISHIJIMA S,et al.Mechanical property improvement of carbon fiber reinforced epoxy composites by Al2O3 filler dispersion[J].Materials Letters,1996,27:21-25.  SEIPENBUSCH M,FROESCHKE S,WEBER A P,et al.Investigations on the fracturing of nanoparticle agglomerates-first results[J].J Proc Mech Eng Part E,2002,216:219-225.  BERLIN A A,VOLFSON S A,ENIKOLOPIAN N S,et al.Principles of Polymer Composites[M].Berlin:Springer-Verlag,1986.  WANG Wen-hai,KEYA SADEGHIPOUR,GEORGE BARAN.Finite element analysis of the effect of an interphase on toughening of a particle-reinforced polymer composite[J].Composites:Part A,2008,39:956-964.  JIANG Z,HUI ZHANG,ZHONG ZHANG,et al.Improved bonding between PAN-based carbon fibers and fullerene-modified epoxy matrix[J].Composites:Part A,2008,39(11):1762-1767.  HUSSAIN M,NAKAHIRA A,NISHIJIMA S,et al.Evaluation of mechanical behavior of CFRC transverse to the fiber direction at room and cryogenic temperature[J].Composites Part A-Applied Science and Manufacturing,2000,31(2):173-179.